Politics of secularism and IR

It has been suggested that the rise of religion confronts IR theory with a theoretical challenge comparable to that of the end of the Cold War or the emergence of globalization. I agree. To understand why we need to turn to the politics of secularism. How might we think about secularisms, in the plural, as forms of political authority in contemporary international relations? What does this mean for IR theory and the resurgence of religion? What kinds of politics follow from different forms of secular commitments, traditions, habits, and beliefs?